On 24 August your vessel is enroute from...

Question 1 / 2066636eea28f7522a1c51ad86

Question 1 of 2066636eea28f7522a1c51ad86

On 24 August your vessel is enroute from Perth, Australia, to Bombay, India. Evening twilight will occur at 1807 zone time and your vessel's DR position will be LAT 27°17.0' S, LONG 83°17.0' E. Considering their magnitude and location, what are the three stars best suited to observe for a fix at star time?

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🔍 Key Concepts

• Star selection for evening twilight fixes (brightness, altitude, azimuth separation) • How latitude and declination affect whether a star is well-placed in the sky • Use of azimuth/altitude spread (60°–120° apart in bearing, 15°–75° in altitude) for a good 3-star fix

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• From LAT 27° S, which options give you at least one or two good southern stars and not only far‑north polar stars? • Looking at each set, which three-star group is most likely to give you a wide spread in azimuth (not all in the same general direction) at evening twilight? • Which choice includes stars that are all bright "navigator" stars commonly listed near the top of star-selection tables (HO 249/229)?

✅ Before You Answer

• Verify which stars are 1st magnitude or very bright 2nd magnitude, since the question stresses magnitude. • Check that no star in the set has a declination so far north that, from 27° S, it would be extremely low or even below the horizon at twilight. • Confirm the chosen group would give good geometric spread: not bunched together in one sector of the sky and not all at very high or very low altitudes.

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Question 1 / 2066636eea28f7522a1c51ad86

Question 1 of 2066636eea28f7522a1c51ad86

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Question 1 of 20

66636eea28f7522a1c51ad86

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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